![]() Let the user see the device’s idea where that pen touched each time was/is. This allows keeping it fast, yet also allows doing it more accurately with more effort and time. Possibly untapped markers are left to use whatever default/factory/previous calibration they might have. Show all the markers immediately, and let the user tap them in any order desired, and as many or few of them as wanted, by having a quality indication and “ready” button somewhere, shown immediately at the begin. Just add a mark or counter next to each marker as the user taps them, so he knows which are done and how many times. The averaging helps in reducing the tapping inaccuracy of the user (not the device). Let the user tap each marker as many times wanted, calculating averages of all taps for each spot if tapped more than once. This should reduce the errors from approximations between measured points. Have more measurement points, not only 5 (corners and center), but e.g. Some ideas that might make it better, while also allowing it to be quick and easy, if so wanted… The issue is unfortunately quite common with almost all stylus-using devices the calibration method is inadequate, made to be quick and easy for the user, but leaving the measurements with small errors, and the error-correction mapping too sparse. I have done the calibration now twice, latter time giving slightly better results, but still a bit inaccurate in some parts of the display.
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